John david stiecklee



(No Model.)

J. D. STIRGKLER.

PROCESS 0 1-" RIVETING. v No. 439,043. Patented Oct. 21, 1890.

UNITED STATES PATENT OFFICE.

STANDARD RIVET COMPANY, OF SAME PLACE.

PROCESS OF RIVETING.

SPECIFICATION forming part of Letters Patent No. 439,043, dated October21,1890.

Application filed April 21, 1890. Serial No. 348,937. (No model.)

To all whom it may concern.-

Be it known that I, J OHNDAVID STIRCKLER, of Boston, in the county ofSuEolk and State of Massachusetts, have invented a new and usefulImprovement in Process of Biveting, of which the following is aspecification, reference being had to the accompanying drawings, inwhich- Figure 1 is a view showing a rivet through material, with a punchin position to strike the end of the shank. Fig. 2 is a sectional Viewof what is shown in Fig. 1, the punch being in its lowest position. Fig.3 is a plan of the rivet in place in stock after the end of the shankhas been operated on by the punch. Fig. 4 is a view, partly in section,of my new rivet in place in stock and ready to receive the blow of anupsetting-die. Fig. 5 is a view, partly in section, of the rivet inplace in stock and'of the upsetting-die, showing the end of the rivetafter its shank has been upset. Fig. 6 is a plan of the upset rivet inplace in stock. Figs. 7 and 8 showa modification.

My invention is an improvement on the process or mode of riveting setforth inmy patent, No. 415,885, dated November 26, 1889, the object ofmy present invention being to cheapen and simplify the process set forthin my patent, and at the same time to produce a method better adaptedthan my patented method for practice on a commercial scale.

In my patent, No. 415,885, my plan is-to break or cut off the centralcore after upsetting or spreading the circumferential portion of theshank surrounding the central core.

My present invention consists in putting the rivet through the stock,the rivet being inserted through a hole already formed or making its ownhole and then cupping and upsetting the end of the shank.

In the drawings, a is the material, 6 the rivet, and d the hollow punchwhich I prefer to use to cup the end of the shank. This hollow punch islike the one I use in my patent, and forms an annular groove (1 in theend of the shank, this groove separating the circumferential portion (1from the central core (1 Since making my patented invention I havediscovered that it is quite unnecessary to cut out or break ofi thecentral core d''. The hollow punch which I preferably employ is forcedinto the end of the shank forming the core 01 and circumferentialportion, which is bent outward. This enables me to have the shank of therivet fill the hole in the material, this being a very important matter,as is well known to all skilled in the art. When the punch is withdrawn,a die f is brought into play and the circumferential part of the shankupset, forming a flange and securing the rivet securely in place. At thesame time by the same die the central core is smashed down, as shown inthe drawings.

In the modification the punch, instead of being hollow, is solid, andsimply cups the end of the rivet-shank, and this cupped end is thenupset. By this plan I am enabled to i have the rivet-shank fill the holein the ma terial; but I greatly prefer to use the hollow punch and treatthe rivet-shank as shown in my other figures, because the solid punch informing the cup compresses the metal in some cases more than isdesirable. The hollow punch cuts into the shank and the upset is formedwithout fracture and with great neatness and smoothness. The centralcore being smashed down, adds somewhat to the strength of the fastening,re-enforcing in a measure the upset flange.

Another feature of my invention is the die f, the face of which isformed with a cup 1 within a cup 2, the bottom or endwall 0f the cup 1engaging the end of the central core and forcing the core toward themain part of the shank at the same time the circumferential portion isturned over or upset to form the flange.

What I claim is 1. The improvement in the art of riveting, consisting inputting the rivet through the material and then cupping the end of theshank and upsetting that cupped end, substantially as and for thepurpose set forth.

2. The improvement in the art of riveting,

consisting in putting the rivet through thematerial, then forming theend of the shank with the circumferential part and central core, andthen smashing down the circumferential part and central core,substantially as and for the purpose set forth.

8. Adie having its face formed with a cup 1 within a cup 2,substantially as and for the purpose set forth.

JOHN DAVID STIRCKLER. Witnesses:

J. E. MAYNADIER, EDWARD S. BEACH.

